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Sinister lines on my Monitor Screen

I have a Dell Inspiron 4000 laptop. Recently a vertical, thin, green line has appeared about 2 inches in from right side of screen. This remains constant throughout all programs. It does NOT appear when I connect to an External Monitor. I know Dell will say 'replace the screen uni't. But I would like to know whether there are any tests or other options open to me - am good with screwdriver and voltmeter...so on.

As for what you can do yourself, probably not much anyway.
Manufacturers of laptops make damn sure its close to impossible to replace just one part.
Especially when it comes to screens there really isnt much you can do, at least thats what I heard.

Sinister line on my Monitor Screen

Thanks for help. Since first posting I have now replaced the
LCD Flex cables 14.4" 625FR. This does not solve the problem. (Also, the problem does NOT not occur on an external monitor).
I am very curious to know what exactly might cause these lines. I also want to remove them without paying Dell an arm and a leg for a new display. Any further advice on this.